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Free Physical Memory Available On Solaris

What is the best way to check how much memory used for each process and free memory is available?
I checked swap -s , prstat -a,
I am not getting clear after analysing swap -s, prstat -s, and echo
'::memstat' | mdb - k.

Also point need to note that Oracle user having shared memory not actual, so in your direct calculation is missing total size. Also Brain suggest Solaris internal book is very much helpful to get real value of runtime utilization.